In today’s air-tight homes and buildings, Indoor Air Quality is a growing concern. Household dust can contain dust mites, molds, mildew, pollen and animal dander. Many of these contaminates are circulated through the central air systems and can aggravate the symptoms of asthma and allergies. Regular cleaning and maintenance of your furnace duct system can help improve Indoor Air Quality for staff, co-workers and family. Action Services recommends having your furnace ducts cleaned every 2to 3 years.